I recently needed 'hard to find' spares for a Grundig Satellit 650 radio and found them at radio-antik a German based supplier. It seems Helmut breaks down radios and sells off the parts. His list is amazing. It's largely 'modern' German and other European radios. He does not understand English too well so best to use Google translate to email him in German. You can also translate the whole site by using Google translate, just plonk the web site address into the translater and it provides the address of a translated version. Also, he does not have an online ordering system as such, you choose the parts you want from his excellently presented lists and then email him and he gives you his bank details to make a bank transfer. My parts just arrived, took just over a week, well packed and as described. From my experience, well recommended.
www.radio-antik.de
helmut.schott@radio-antik.de